For the most part I understand the purpose of clocking. The majority of our circuits are Sprint MPLS and the clocking is derived from the line.
What I'm confused about is how to configure clocking on a pair of routers that are connected to each other via point to point T1's as well as other networks that provide clocking.
For this new setup I have the following
2 Cisco 2801 Routers
Router A has
- One VWIC2-2MFT-T1/E1 card (connected to Router B)
- One WIC-1DSU-T1-V2 Card (connected to Sprint MPLS)
Router B has
- One VWIC2-2MFT-T1/E1 card (Connected to Router A)
- One ADSL card (Connected to Covad)
Router A's WIC-1DSU-T1-V2 is connected to a Sprint MPLS T1 with clocking coming from the line.
Router A's VWIC2-2MFT-T1/E1 is connected to Router B's VWIC2-2MFT-T1/E1 via a pair of Point to Point T1's configured in a multilink bundle.
On the Point to Points Qwest said one of my devices needs to provide clocking to the other, so on Router B on Controller T1 0/2/0 and 0/2/1 I set "clock source internal"
I am seeing slips on both serial interfaces and am a little unsure as to why.
From the reading I've done on the Cisco site it seems to indicate a router can only have one clocking source for all interfaces, so I'm lost.